Advertising pillar



FIG. 1 is a perspective view of the top, front and right side of an advertising pillar showing my new design;

FIG. 2 is a front view thereof, the rear view being identical thereto;

FIG. 3 is a right side view thereof, the left side view being identical thereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for an advertising pillar, as shown and described. 